Take a look here
] An example is in C#, but i think it's not problem to understand it or translate
If you can read BLOB field into a memory or image bitmap, you're home! ;)
Save this data into temporary folder (
), add picture to the worksheet with option
and delete picture from temporary folder.
When a picture is in memory, you can pate it content into Worksheet ;)
More at: AddPicture Method